Nut-lock.



UNITED STATES PATENT OFFICE.

- ALFRED MARIE RAVILLY, or ASNIERES, FRANCE.

Specification of Letters Patent.

Patented March 16, 1909.

Application filed'January 2, 19( )8. Serial No. 409,064.

To all whom it may concern:

Be it known that I, ALFRED MARIE RAV- ILLY, a citizen of the French Republic, and resident of-Asnieres, France, have invented certain new and useful Improvements in N ut- Locks, of which the following is a specification.

This invention relates .to nut locks its object being to provide a device of this kindv which will be efficient in use and very simple in construction.

In the annexed drawings: Figure 1 is a side elevation view of a bolt provided with my nut lock this bolt being made of two parts the right hand one of which is shown rotated 180 with reference to the position which it should occupy when the two parts are juxtaposed end on end. Fig. 2 shows a similar view of same as Well as a section of the nut and adjacent parts, in the position of untightening; Figs. 3 and4 show respectively two cross sections of the assembled bolt arts and of the nut in the'tightening and untlghteung ositions. I

As s own by the drawings, the bolt comprises two parts 1 and 2 which are screw threaded wlth the same pitch and their juxtaposed ends are cut away so as to leave on the part 1 a semi-cylindrical part 3 and on the member 2 a semi-cylindrical part 4 of which a cylinder sector is afterward. cut away, as at 5, see Figs. 1, 2 and 3. The transverse faces 6 and 11 of the member 1 correspond to the faces 12 and 13 res ectively of member 2. The faces 6 am 12 have even the same inclination of any suitable pitch with reference to the axis of the bolt. The above described cuttin s are made in such a manner that the bolts avin a diameter of 19 millimeters and less sha have four threads on one side of the section and three threads on the other side, on each cut away part which forms the sector 4 and the art 3 this bolt has been shown by Fig. 1. or bolts having 20 millimeters and more, the section will be made so as to leave Eve threads on one side of the section and four on the other side of each sectioned part. The angle a (Fi 3) of the removed sector 5' may vary for laolts of different diameters from 38 to 50 and the face 7, 8 of the sector 4 could attain the number of 58 of the diameter of the bolt. Finally the nut 14 should have a height which is one-third greater than that of ordinary. nuts for a bolt of the same diameter 7, 9 of part 4 abuts against the plane face of the semi-cylindrical part 3 as shown by Fig. 3 the fixation is obtained without an difficulty; if it is desired to untighten or oosen the nut, the sector 4 Will,assume the position shown by Figs. 2 and 4; the part or member 2, in its rotary motion when the nut is untightened without intention, is forced to rise upon the incline 6 which has for its efiect to displace the threads of the screw with reference to those of the nut, and to jam the threads thus preventing any motion of-the' nut.

When it is desired to unti hten the nut without difiiculty' one intro uces a screw driver into the slot 10 and holds thus the part or member 2 in its'initial position, see

ig. 3, and the nut may be unscrewed without opposing any resistance.

V The above described nut lock could be applied to the screw plugs or stoppers and for tighteningwheels of carriages of any kind, at the end of the axles or of the haves.-

Having now fully described my said invention, what I claim and desire to secure by Letters Patent, is

1. In a nut lock, the combination with a nut, of a bolt comprising two parts 1, 2,

screw-threaded with the same pitch, thejuxtaposed ends of said parts being cutaway to leave a semi-cylindrical portion 3 on the part 1 and a semi-oylindrical portion 4 on the part 2, said portion 4 having a sector shaped section removed at 5 and providing a face 8 of a length sli htly greater than the radius of the b0 t, said part 1 having an in clined transverse face 6 and a non-inclined face 11 and the part2 having the inclined face 12 and the non-inclined face 13, said faces 6 and 12 having the same inclination relatively to the axis of the bolt.

2. In a nut lock the combination, with a nut, of a bolt having a diameter not exceeding 19 millimeters and com rising two, parts 1 and 2, screw-threaded thesame pitch, the juxtaposed ends of said arts being cut away to cave a semi-cylind i'ical portion 3 on the part 1 and a semicylindrical portion 4 on thepart 2, said portion 4 having a sector shaped-section removed at 5 and providing a face 8 of a length slightly greater than the prising four threads on one side. and three radius of the bolt, said part 1 having an inthreads on the other as set forth. 10 clined transverse face 6 and a non-inclined In testimony whereof I have hereunto set face 11 and the part 2 having the inclined my hand in presence of-two witnesses.

face 12 and the non-inclined face 13, said ALFRED MARIE RAVILLY. faces 6 and 12 having the same inclination Vvitnesses:

relatively to the axis of the bolt, the section DEAN BJMAsoN,

of the adjacent ends of both parts 1, 2 com- I T. DELLREUQK. 

